Hey guys Ive not found a topic for this one, anyway let me know if im wrong, now to the actual complaint, I found out the other day a misterious whistle coming from under the hood, which happens at 4000 RPM and higher when I floor it, I suspect the Intake Manifold Gasket or a kind of vacuum leak. Now I wanted to find out some more about this problem, if you guys have made some experience, Ive read also in the net, it might be a cracked exhaust manifold, I would appreciate any help. Best regards